Re: [Xen-devel] [PATCH 1 of 3] libxl: take node distances into account during NUMA placement

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Dario Faggioli writes ("Re: [Xen-devel] [PATCH 1 of 3] libxl: take node 
distances into account during NUMA placement"):
> On Thu, 2012-10-18 at 16:17 +0100, George Dunlap wrote:
> > Looks good overall -- my only worry is the N^2 nature of the
> > algorithm.  We're already doing some big combinatorial thing to
> > generate the candidates, right?  
> >
> It is, with N being the number of nodes, which we discussed thoroughly
> already a couple of months ago, and reached consensus on the fact that N
> will stay less than 8 for the next 5 (but probably even more) years. :-)

No, I don't think we did reach consensus about that.  It was asserted
but I dissented.  I don't think this is a reasonable assumption.

> In any case, if something really unexpected happens, and N jumps to
> anything bigger than 16, the placement algorithm won't even start, and
> we'll never reach this point!.

And that is the safety catch you put in because I didn't think the
assumption about numbers of cpus was reasonable.

Ian.

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